There is a heap buffer overflow in DumpScreen2RGB() in gif2rgb.c. This occurs when a crafted gif file, where size of color table is < 256 but image data contains pixels with color code highier than size of color table. This causes oferflow of ColorMap->Colors array.
Fix the issue by checking if value of each pixel is within bounds of given color table. If the value is out of color table, print error message and exit. Signed-off-by: Nikhil R <nikhi...@kpit.com> --- .../giflib/files/CVE-2022-28506.patch | 40 +++++++++++++++++++ .../recipes-devtools/giflib/giflib_5.2.1.bb | 4 +- 2 files changed, 43 insertions(+), 1 deletion(-) create mode 100644 meta-oe/recipes-devtools/giflib/files/CVE-2022-28506.patch diff --git a/meta-oe/recipes-devtools/giflib/files/CVE-2022-28506.patch b/meta-oe/recipes-devtools/giflib/files/CVE-2022-28506.patch new file mode 100644 index 000000000..221e10811 --- /dev/null +++ b/meta-oe/recipes-devtools/giflib/files/CVE-2022-28506.patch @@ -0,0 +1,40 @@ +From 368f28c0034ecfb6dd4b3412af4cc589a56e0611 Mon Sep 17 00:00:00 2001 +From: Matej Muzila <mmuz...@redhat.com> +Date: Mon, 30 May 2022 09:04:27 +0200 +Subject: [PATCH] Fix heap-buffer overflow (CVE-2022-28506) + +There is a heap buffer overflow in DumpScreen2RGB() in gif2rgb.c. This +occurs when a crafted gif file, where size of color table is < 256 but +image data contains pixels with color code highier than size of color +table. This causes oferflow of ColorMap->Colors array. + +Fix the issue by checking if value of each pixel is within bounds of +given color table. If the value is out of color table, print error +message and exit. + +Fixes: #159 + +Upstream-Status: Backport [https://sourceforge.net/p/giflib/code/ci/5b74cdd9c1285514eaa4675347ba3eea81d32c65/] +Signed-off-by: nikhil r <nikhi...@kpit.com> +--- + gif2rgb.c | 5 +++++ + 1 file changed, 5 insertions(+) + +diff --git a/gif2rgb.c b/gif2rgb.c +index 8d7c0ff..d9a469f 100644 +--- a/gif2rgb.c ++++ b/gif2rgb.c +@@ -294,6 +294,11 @@ static void DumpScreen2RGB(char *FileName, int OneFileFlag, + GifRow = ScreenBuffer[i]; + GifQprintf("\b\b\b\b%-4d", ScreenHeight - i); + for (j = 0, BufferP = Buffer; j < ScreenWidth; j++) { ++ /* Check if color is within color palete */ ++ if (GifRow[j] >= ColorMap->ColorCount) ++ { ++ GIF_EXIT(GifErrorString(D_GIF_ERR_IMAGE_DEFECT)); ++ } + ColorMapEntry = &ColorMap->Colors[GifRow[j]]; + *BufferP++ = ColorMapEntry->Red; + *BufferP++ = ColorMapEntry->Green; +-- +2.25.1 diff --git a/meta-oe/recipes-devtools/giflib/giflib_5.2.1.bb b/meta-oe/recipes-devtools/giflib/giflib_5.2.1.bb index 79afe9a70..011ca1ffb 100644 --- a/meta-oe/recipes-devtools/giflib/giflib_5.2.1.bb +++ b/meta-oe/recipes-devtools/giflib/giflib_5.2.1.bb @@ -7,7 +7,9 @@ CVE_PRODUCT = "giflib_project:giflib" DEPENDS = "xmlto-native" -SRC_URI = "${SOURCEFORGE_MIRROR}/giflib/${BP}.tar.gz" +SRC_URI = "${SOURCEFORGE_MIRROR}/giflib/${BP}.tar.gz \ + file://CVE-2022-28506.patch" + SRC_URI[sha256sum] = "31da5562f44c5f15d63340a09a4fd62b48c45620cd302f77a6d9acf0077879bd" do_install() { -- 2.25.1
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